Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
<stefan_trethan@g...> wrote:
> On Sun, 25 Apr 2004 11:21:52 -0000, ballendo <ballendo@y...> wrote:
> 
> > Hello Stefan,
> >
> > This is done by empirical testing/experimentation at first, using 
the
> > canned cycle and/or macro params. Then it will be repeatable.
> >
> > I already explained the screw. With the air pressure syringe 
types,
> > the timing  can be controlled using G04, which is a dwell in
> > milliseconds.
> >
> > Hope this helps,
> >
> > Ballendo
> >
> > P.S. I have never used an excel program to create a toolpath. 
Others
> > have had great success doing so; I've just never found it 
necessary.
> >
> 
> as in my other post, how do you insert these gerber commands?
> Do you edit the file all by hand or do you have a software where 
you just 
> load the file?
> 
> ST


I use TurboCNC and in that they have a jump command,  think of a goto 
in prgramming.

I move to the X/Y location, then jump to the drilling routine.

The drilling routine tells the Z to feed, and includes feed rate and 
feed depth.  it also included retraction speed and retraction height.

It would be a simple matter to add a second axis in that routing to 
dispense some value of paste.

I immeadiatly think that one could create some common units of paste.

A 0603 cap might get 6 units per pad, an 0805 might get 8 units.  A 
SOIC chip might get 6 units per pad, a TSSOP might get 3 units and so 
on.

With some programming, this should be simple enough and I am sure 
that in the near future, someone will offer the software for us home-
brew types.

Dave